Small space between window bar and body

[dlamei]

When setting WindowRounding > 0 and io.FontGlobalScale to some non-integer values, a pixel wide space appears between the title bar and body of the window

But it does not happen with every non integer FontGlobalScale

WindowRounding = 0, FontGlobalScale = 1.2

WindowRounding = 1, FontGlobalScale = 1.2

WindowRounding = 1, FontGlobalScale = 1.3

example:

io.FontGlobalScale = 1.2;

// Colors to make it more visible
ImGui::PushStyleColor(ImGuiCol_WindowBg, { 0, 0, 0, 1 });
ImGui::PushStyleVar(ImGuiStyleVar_WindowRounding, 1);

ImGui::Begin("###1");
ImGui::End();

ImGui::PushStyleColor(ImGuiCol_WindowBg, { 1, 1, 1, 1 });
ImGui::Begin("###2");
ImGui::End();

ImGui::PopStyleColor(2);
ImGui::PopStyleVar();

Version: 1.90 (WIP) Branch: master

Opengl3 + GLFW Operating System: Windows 10 and Ubuntu 20

[ocornut]

We don’t really support non integer sized fonts and therefore non-integer values of FontGlobalScale.