Texture-based thick lines: Fixes for AddCustomRect api, add IMGUI_HAS_TEXLINES define (temporarily) to facilitate working with test cases, Demo allows growing FrameBorderSize for testing

imgui.h

@@ -1993,6 +1993,8 @@ enum ImDrawCornerFlags_
     ImDrawCornerFlags_All       = 0xF     // In your function calls you may use ~0 (= all bits sets) instead of ImDrawCornerFlags_All, as a convenience
 };
 
+#define IMGUI_HAS_TEXLINES      1
+
 enum ImDrawListFlags_
 {
     ImDrawListFlags_None                    = 0,

imgui_demo.cpp

@@ -3698,7 +3698,7 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
             ImGui::SliderFloat("WindowBorderSize", &style.WindowBorderSize, 0.0f, 1.0f, "%.0f");
             ImGui::SliderFloat("ChildBorderSize", &style.ChildBorderSize, 0.0f, 1.0f, "%.0f");
             ImGui::SliderFloat("PopupBorderSize", &style.PopupBorderSize, 0.0f, 1.0f, "%.0f");
-            ImGui::SliderFloat("FrameBorderSize", &style.FrameBorderSize, 0.0f, 1.0f, "%.0f");
+            ImGui::SliderFloat("FrameBorderSize", &style.FrameBorderSize, 0.0f, 4.0f, "%.1f");
             ImGui::SliderFloat("TabBorderSize", &style.TabBorderSize, 0.0f, 1.0f, "%.0f");
             ImGui::Text("Rounding");
             ImGui::SliderFloat("WindowRounding", &style.WindowRounding, 0.0f, 12.0f, "%.0f");

imgui_draw.cpp

@@ -2393,8 +2393,8 @@ static void ImFontAtlasBuildRegisterAALineCustomRects(ImFontAtlas* atlas)
     if ((atlas->Flags & ImFontAtlasFlags_NoAALines))
         return;
 
-    const int max_width = IM_DRAWLIST_TEX_AA_LINES_WIDTH_MAX; // The maximum line width we want to generate
     // The "max_width + 2" here is to give space for the end caps, whilst height (IM_DRAWLIST_TEX_AA_LINES_WIDTH_MAX+1) is to accommodate the fact we have a zero-width row
+    const int max_width = IM_DRAWLIST_TEX_AA_LINES_WIDTH_MAX; // The maximum line width we want to generate
     atlas->AALineRectId = atlas->AddCustomRectRegular(max_width + 2, IM_DRAWLIST_TEX_AA_LINES_WIDTH_MAX + 1);
 }