Missing right & bottom table outer borders when inside a window without padding (1.90 regression)

[cfillion]

Version/Branch of Dear ImGui:

1.90 - 1.90.4, since a340718

Back-ends:

Tested with example_glfw_metal, example_glfw_opengl3 & custom

Compiler, OS:

macOS

Full config/build information:

No response

Details:

Commit a340718 (1.90) draws the bottom and right borders of tables offset by 1px, beyond the expected area and potentially past the window's clip rect.

They're invisible when the table spans all available space within a child window or a normal window with no padding.

BeginTable(outer_size = ImVec2(100, 100)) produces a 101x101px table.

Screenshots/Video:

Invisible/clipped borders:

1px bigger than child window borders and item frames = invading into window padding and item spacing:

(Zoomed 3x)

Minimal, Complete and Verifiable Example code:

auto table = [] (ImVec2 size = {}) {
  if(ImGui::BeginTable("table", 2, ImGuiTableFlags_Borders /* with an S */ | ImGuiTableFlags_ScrollY, size)) {
    ImGui::TableNextRow();
    ImGui::TableNextColumn();
    ImGui::Text("Hello, world!");
    ImGui::EndTable();
  }
};

ImGui::Begin("Case 1");
ImGui::BeginChild("child");
table();
ImGui::EndChild();
ImGui::End();

ImGui::PushStyleVar(ImGuiStyleVar_WindowBorderSize, 0);
ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, { 0, 0 });
ImGui::Begin("Case 2");
table();
ImGui::End();
ImGui::PopStyleVar(2);

ImGui::Begin("Case 3");
ImGui::BeginChild("child", { 0, 16 }, ImGuiChildFlags_Border /* without an S */); ImGui::EndChild();
table({ 0, 24 });
ImGui::Button("Test", { -FLT_MIN, 0 });
ImGui::End();

[ocornut]

if(ImGui::BeginTable("table", 2, ImGuiTableFlags_Borders /* with an S /
ImGui::BeginChild("child", { 0, 16 }, ImGuiChildFlags_Border / without an S */);

You win :)
0b9adc2

[ocornut]

For now I have reverted a340718 with a131c3e.
I am trying to work on a better solution as this exhibit other minor visual issues, but I believe this one is more damaging currently.
I'll keep this open until I am satisfied with a solution for #6765 and #3752.

[ocornut]

Pushed new fix 864a2bf
Please see #6765 (comment) for details.
Hope it works this time!

[cfillion]

Thank you!