InputScalar, InputInt, InputFloat: added ImGuiInputTextFlags_ParseEmptyRefVal, ImGuiInputTextFlags_DisplayEmptyRefVal. (#7305)

imgui.h

@@ -1104,6 +1104,8 @@ enum ImGuiInputTextFlags_
     ImGuiInputTextFlags_CallbackResize      = 1 << 18,  // Callback on buffer capacity changes request (beyond 'buf_size' parameter value), allowing the string to grow. Notify when the string wants to be resized (for string types which hold a cache of their Size). You will be provided a new BufSize in the callback and NEED to honor it. (see misc/cpp/imgui_stdlib.h for an example of using this)
     ImGuiInputTextFlags_CallbackEdit        = 1 << 19,  // Callback on any edit (note that InputText() already returns true on edit, the callback is useful mainly to manipulate the underlying buffer while focus is active)
     ImGuiInputTextFlags_EscapeClearsAll     = 1 << 20,  // Escape key clears content if not empty, and deactivate otherwise (contrast to default behavior of Escape to revert)
+    ImGuiInputTextFlags_ParseEmptyRefVal    = 1 << 21,  // InputFloat(), InputInt(), InputScalar() etc. only: parse empty string as zero value.
+    ImGuiInputTextFlags_DisplayEmptyRefVal  = 1 << 22,  // InputFloat(), InputInt(), InputScalar() etc. only: when value is zero, do not display it. Generally used with ImGuiInputTextFlags_ParseEmptyRefVal.
 
     // Obsolete names
     //ImGuiInputTextFlags_AlwaysInsertMode  = ImGuiInputTextFlags_AlwaysOverwrite   // [renamed in 1.82] name was not matching behavior