SymbolTest: Test for rendering dashed lines with mid symbols

Adding test step and test files for testing the correct rendering of
dashed lines with mid symbols.

test/data/symbols/dashed-line-with-mid-symbols.omap

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<map xmlns="http://openorienteering.org/apps/mapper/xml/v2" version="9">
+<notes></notes>
+<georeferencing scale="10000"><projected_crs id="Local"/></georeferencing>
+<colors count="1">
+<color priority="0" name="Black 100%" c="0" m="0" y="0" k="1" opacity="1"><spotcolors><namedcolor>BLACK</namedcolor></spotcolors><cmyk method="custom"/><rgb method="cmyk" r="0" g="0" b="0"/></color>
+</colors>
+<barrier version="6" required="0.6.0">
+<symbols count="3" id="ISOM 2017-2">
+<symbol type="2" id="0" code="514" name="Ruined wall"><description>A ruined or less distinct wall. Minimum height 0.5 m.
+Minimum length: two dashes (3.65 mm - footprint 55 m). If shorter, the object must be exaggerated to the minimum length or changed to symbol Wall (513).</description><line_symbol color="0" line_width="210" minimum_length="5475" join_style="1" cap_style="0" start_offset="0" end_offset="0" dashed="true" segment_length="3750" end_length="1875" show_at_least_one_symbol="true" minimum_mid_symbol_count="0" minimum_mid_symbol_count_when_closed="0" dash_length="3000" break_length="525" dashes_in_group="1" in_group_break_length="750" mid_symbols_per_spot="1" mid_symbol_distance="0"><mid_symbol><symbol type="1" code="" name="Mid symbol"><point_symbol rotatable="true" inner_radius="300" inner_color="0" outer_width="0" outer_color="-1" elements="0"/></symbol></mid_symbol></line_symbol></symbol>
+<symbol type="2" id="1" code="517" name="Ruined fence"><description>A ruined or less distinct fence. If the fence forms an enclosed area, tags should be placed inside.
+Minimum length: two dashes (3.65 mm - footprint 55 m). If shorter, the symbol must be exaggerated to the minimum length or changed to symbol Fence (516).</description><line_symbol color="0" line_width="210" minimum_length="5475" join_style="1" cap_style="0" start_offset="0" end_offset="0" dashed="true" segment_length="3750" end_length="1875" show_at_least_one_symbol="true" minimum_mid_symbol_count="0" minimum_mid_symbol_count_when_closed="0" dash_length="3000" break_length="525" dashes_in_group="1" in_group_break_length="750" mid_symbols_per_spot="1" mid_symbol_distance="0"><mid_symbol><symbol type="1" code="" name="Mid symbol"><point_symbol rotatable="true" inner_radius="1500" inner_color="-1" outer_width="0" outer_color="-1" elements="1"><element><symbol type="2" code=""><line_symbol color="0" line_width="210" minimum_length="0" join_style="1" cap_style="0" start_offset="0" end_offset="0" segment_length="6000" end_length="0" show_at_least_one_symbol="true" minimum_mid_symbol_count="0" minimum_mid_symbol_count_when_closed="0" dash_length="6000" break_length="1500" dashes_in_group="1" in_group_break_length="750" mid_symbols_per_spot="1" mid_symbol_distance="0"/></symbol><object type="1"><coords count="2">0 0;375 650;</coords><pattern rotation="0"><coord x="0" y="0"/></pattern></object></element></point_symbol></symbol></mid_symbol></line_symbol></symbol>
+<symbol type="2" id="2" code="517.1" name="Ruined fence (test)"><description>Test with small line width</description><line_symbol color="0" line_width="50" minimum_length="5475" join_style="1" cap_style="0" start_offset="0" end_offset="0" dashed="true" segment_length="3750" end_length="1875" show_at_least_one_symbol="true" minimum_mid_symbol_count="0" minimum_mid_symbol_count_when_closed="0" dash_length="3000" break_length="525" dashes_in_group="1" in_group_break_length="750" mid_symbols_per_spot="1" mid_symbol_distance="0"><mid_symbol><symbol type="1" code="" name="Mid symbol"><point_symbol rotatable="true" inner_radius="1500" inner_color="-1" outer_width="0" outer_color="-1" elements="1"><element><symbol type="2" code=""><line_symbol color="0" line_width="50" minimum_length="0" join_style="1" cap_style="0" start_offset="0" end_offset="0" segment_length="6000" end_length="0" show_at_least_one_symbol="true" minimum_mid_symbol_count="0" minimum_mid_symbol_count_when_closed="0" dash_length="6000" break_length="1500" dashes_in_group="1" in_group_break_length="750" mid_symbols_per_spot="1" mid_symbol_distance="0"/></symbol><object type="1"><coords count="2">0 0;375 650;</coords><pattern rotation="0"><coord x="0" y="0"/></pattern></object></element></point_symbol></symbol></mid_symbol></line_symbol></symbol>
+</symbols>
+<parts count="1" current="0">
+<part name="default part"><objects count="4">
+<object type="1" symbol="1"><coords count="7">-47979 -65916 1;-46790 -66102;-47260 -69147;-46711 -69502 1;-45227 -70462;-43504 -67304;-42086 -69484 16;</coords><pattern rotation="0"><coord x="0" y="0"/></pattern></object>
+<object type="1" symbol="0"><coords count="7">-40280 -65313 1;-39258 -66072;-40623 -68494;-39724 -69181 1;-38416 -70181;-39233 -71180;-36859 -70732;</coords><pattern rotation="0"><coord x="0" y="0"/></pattern></object>
+<object type="1" symbol="1"><coords count="13">-54931 -69830 1;-56003 -68619;-55890 -66767;-54679 -65695 1;-53468 -64623;-51617 -64735;-50544 -65947 1;-49472 -67158;-49585 -69009;-50796 -70082 1;-52007 -71154;-53858 -71041;-54931 -69830 18;</coords><pattern rotation="0"><coord x="0" y="0"/></pattern></object>
+<object type="1" symbol="2"><coords count="4">-48463 -61909 33;-48152 -64235;-44117 -65995;-42140 -64525 32;</coords><pattern rotation="0"><coord x="0" y="0"/></pattern></object>
+</objects></part>
+</parts>
+<templates count="0" first_front_template="0">
+<defaults use_meters_per_pixel="true" meters_per_pixel="0" dpi="0" scale="0"/>
+</templates>
+<view>
+<grid color="#646464" display="0" alignment="0" additional_rotation="0" unit="1" h_spacing="500" v_spacing="500" h_offset="0" v_offset="0" snapping_enabled="true"/>
+<map_view zoom="18.8854" position_x="-46306" position_y="-66619"><map opacity="1" visible="true"/><templates count="0"/></map_view>
+</view>
+</barrier>
+</map>

test/symbol_t.cpp

@@ -234,6 +234,7 @@ private slots:
 		    { "testdata:symbols/line-symbol-cap-variants.omap", 50 },
 		    { "testdata:symbols/line-symbol-start-end-symbol.omap", 50 },
 		    { "testdata:symbols/line-symbol-mid-symbol-variants.omap", 50 },
+		    { "testdata:symbols/dashed-line-with-mid-symbols.omap", 80 },
 #ifdef ENABLE_VOLATILE_RENDER_TESTS
 		    { "data:examples/complete map.omap", 5 },
 		    { "data:examples/forest sample.omap", 10 },