InputText: Pasting a multi-line buffer into a single-line edit replaces carriage return by spaces. (#8459)

docs/CHANGELOG.txt

@@ -77,6 +77,8 @@ Other changes:
   inner/outer padding applied to hit-testing of windows borders and detection
   of hovered window.
 - InputText: Allow CTRL+Shift+Z to redo even outside of OSX. (#8389) [@tanksdude]
+- InputText: Pasting a multi-line buffer into a single-line edit replaces
+  carriage return by spaces. (#8459)
 - InputTextWithHint(): Fixed buffer-overflow (luckily often with no visible effect)
   when a user callback modified the buffer contents in a way that altered the
   visibility of the preview/hint buffer. (#8368) [@m9710797, @ocornut]

imgui_widgets.cpp

@@ -4294,7 +4294,13 @@ static bool InputTextFilterCharacter(ImGuiContext* ctx, unsigned int* p_char, Im
     if (c < 0x20)
     {
         bool pass = false;
-        pass |= (c == '\n') && (flags & ImGuiInputTextFlags_Multiline) != 0; // Note that an Enter KEY will emit \r and be ignored (we poll for KEY in InputText() code)
+        pass |= (c == '\n') && (flags & ImGuiInputTextFlags_Multiline) != 0;    // Note that an Enter KEY will emit \r and be ignored (we poll for KEY in InputText() code)
+        if (c == '\n' && input_source_is_clipboard && (flags & ImGuiInputTextFlags_Multiline) == 0) // In single line mode, replace \n with a space
+        {
+            c = *p_char = ' ';
+            pass = true;
+        }
+        pass |= (c == '\n') && (flags & ImGuiInputTextFlags_Multiline) != 0;
         pass |= (c == '\t') && (flags & ImGuiInputTextFlags_AllowTabInput) != 0;
         if (!pass)
             return false;