InputText: Fix named filtering flags disabling newline or tabs in multiline inputs (#4409, #4410)

docs/CHANGELOG.txt

@@ -68,6 +68,7 @@ Other Changes:
 - Tables: Fix invalid data in TableGetSortSpecs() when SpecsDirty flag is unset. (#4233)
 - TabBar: Fixed using more than 32 KB-worth of tab names. (#4176)
 - InputInt/InputFloat: When used with Steps values and _ReadOnly flag, the step button look disabled. (#211)
+- InputText: Fixed named filtering flags disabling newline or tabs in multiline inputs (#4409, #4410) [@kfsone]
 - Drag and Drop: drop target highlight doesn't try to bypass host clipping rectangle. (#4281, #3272)
 - Menus: MenuItem() and BeginMenu() are not affected/overlapping when style.SelectableTextAlign is altered.
 - Menus: fix hovering a disabled menu or menu item not closing other menus. (#211)

imgui_widgets.cpp

@@ -3842,6 +3842,7 @@ static bool InputTextFilterCharacter(unsigned int* p_char, ImGuiInputTextFlags f
     unsigned int c = *p_char;
 
     // Filter non-printable (NB: isprint is unreliable! see #2467)
+    bool apply_named_filters = true;
     if (c < 0x20)
     {
         bool pass = false;
@@ -3849,6 +3850,7 @@ static bool InputTextFilterCharacter(unsigned int* p_char, ImGuiInputTextFlags f
         pass |= (c == '\t' && (flags & ImGuiInputTextFlags_AllowTabInput));
         if (!pass)
             return false;
+        apply_named_filters = false; // Override named filters below so newline and tabs can still be inserted.
     }
 
     if (input_source != ImGuiInputSource_Clipboard)
@@ -3867,7 +3869,7 @@ static bool InputTextFilterCharacter(unsigned int* p_char, ImGuiInputTextFlags f
         return false;
 
     // Generic named filters
-    if (flags & (ImGuiInputTextFlags_CharsDecimal | ImGuiInputTextFlags_CharsHexadecimal | ImGuiInputTextFlags_CharsUppercase | ImGuiInputTextFlags_CharsNoBlank | ImGuiInputTextFlags_CharsScientific))
+    if (apply_named_filters && (flags & (ImGuiInputTextFlags_CharsDecimal | ImGuiInputTextFlags_CharsHexadecimal | ImGuiInputTextFlags_CharsUppercase | ImGuiInputTextFlags_CharsNoBlank | ImGuiInputTextFlags_CharsScientific)))
     {
         // The libc allows overriding locale, with e.g. 'setlocale(LC_NUMERIC, "de_DE.UTF-8");' which affect the output/input of printf/scanf.
         // The standard mandate that programs starts in the "C" locale where the decimal point is '.'.