ProgressBar() fixed rendering when straddling rounded area. (#1296)

imgui.cpp

@@ -7323,7 +7323,7 @@ void ImGui::ProgressBar(float fraction, const ImVec2& size_arg, const char* over
     RenderFrame(bb.Min, bb.Max, GetColorU32(ImGuiCol_FrameBg), true, style.FrameRounding);
     bb.Expand(ImVec2(-window->BorderSize, -window->BorderSize));
     const ImVec2 fill_br = ImVec2(ImLerp(bb.Min.x, bb.Max.x, fraction), bb.Max.y);
-    RenderFrame(bb.Min, fill_br, GetColorU32(ImGuiCol_PlotHistogram), false, style.FrameRounding);
+    RenderRectFilledRangeH(window->DrawList, bb, GetColorU32(ImGuiCol_PlotHistogram), 0.0f, fraction, style.FrameRounding);
 
     // Default displaying the fraction as percentage string, but user can override it
     char overlay_buf[32];