Item-tooltip for text will disappear for a short time the text get resized

[achabense]

Version/Branch of Dear ImGui:

Version 1.90.9

Back-ends:

imgui_impl_sdl2.cpp + imgui_impl_sdlrenderer2.cpp

Compiler, OS:

Windows 10 + MSVC 2022

Full config/build information:

No response

Details:

When the text get resized, IsItemHovered(ImGuiHoveredFlags_ForTooltip) for the text will become 0, even if the mouse remains hovering on the resized one. This can make the tooltip (based on BeginItemTooltip) for the text disappear for a very short time, which I think is not ideal behavior.

Screenshots/Video:

(The tooltip will disappear for a short time when pressing 'Z'.)

Minimal, Complete and Verifiable Example code:

void issue() {
    if (ImGui::Begin("Issue", 0, ImGuiWindowFlags_NoSavedSettings)) {
        static bool i = 0;
        if (ImGui::IsKeyPressed(ImGuiKey_Z)) {
            i = !i;
        }

        ImGui::Text(i ? "ABCDEFG" : "ABCD");
        if (ImGui::BeginItemTooltip()) {
            ImGui::Text("...");
            ImGui::EndTooltip();
        }
        // Will become 0 when the text is resized:
        ImGui::Text("%d", int(ImGui::IsItemHovered(ImGuiHoveredFlags_ForTooltip)));
    }
    ImGui::End();
}

[ocornut]

Thank you for the working repro, this is helpful.

I have pushed a fix as f99febf. I think we may end revisiting this by reworking how we create implicit id for e.g. Text() by using counters, this may apply to drag and drop sources as well.