Implement SCI_GETSELECTIONEMPTY API. Bug #3543121.

4 files changed, 14 insertions, 2 deletions

diff --git a/doc/ScintillaDoc.html b/doc/ScintillaDoc.html
index 0fe4b05c7..2ab2d7f03 100644
--- a/doc/ScintillaDoc.html
+++ b/doc/ScintillaDoc.html
@@ -911,8 +911,8 @@ struct Sci_TextToFind {
     pasting from the clipboard into the document, and clearing the document.
     <code>SCI_CANPASTE</code> returns non-zero if the document isn't read-only and if the selection
     doesn't contain protected text. If you need a "can copy" or "can cut", use
-    <code>SCI_GETSELECTIONSTART()-SCI_GETSELECTIONEND()</code>, which will be non-zero if you can
-    copy or cut to the clipboard.</p>
+    <code>SCI_GETSELECTIONEMPTY()</code>, which will be zero if there are any non-empty
+    selection ranges implying that a copy or cut to the clipboard should work.</p>
 
     <p>GTK+ does not really support <code>SCI_CANPASTE</code> and always returns <code>TRUE</code>
     unless the document is read-only.</p>
@@ -1504,6 +1504,7 @@ struct Sci_TextToFind {
      <br />
 
      <a class="message" href="#SCI_GETSELECTIONS">SCI_GETSELECTIONS</a><br />
+     <a class="message" href="#SCI_GETSELECTIONEMPTY">SCI_GETSELECTIONEMPTY</a><br />
      <a class="message" href="#SCI_CLEARSELECTIONS">SCI_CLEARSELECTIONS</a><br />
      <a class="message" href="#SCI_SETSELECTION">SCI_SETSELECTION(int caret, int anchor)</a><br />
      <a class="message" href="#SCI_ADDSELECTION">SCI_ADDSELECTION(int caret, int anchor)</a><br />
@@ -1615,6 +1616,10 @@ struct Sci_TextToFind {
      Return the number of selections currently active.</p>
 
     <p>
+    <b id="SCI_GETSELECTIONEMPTY">SCI_GETSELECTIONEMPTY</b><br />
+     Return 1 if every selected range is empty else 0.</p>
+
+    <p>
     <b id="SCI_CLEARSELECTIONS">SCI_CLEARSELECTIONS</b><br />
      Set a single empty selection at 0 as the only selection.</p>
 
diff --git a/include/Scintilla.h b/include/Scintilla.h
index 3cacd5310..52d6eed15 100644
--- a/include/Scintilla.h
+++ b/include/Scintilla.h
@@ -787,6 +787,7 @@ typedef sptr_t (*SciFnDirect)(sptr_t ptr, unsigned int iMessage, uptr_t wParam,
 #define SCI_SETADDITIONALCARETSVISIBLE 2608
 #define SCI_GETADDITIONALCARETSVISIBLE 2609
 #define SCI_GETSELECTIONS 2570
+#define SCI_GETSELECTIONEMPTY 2650
 #define SCI_CLEARSELECTIONS 2571
 #define SCI_SETSELECTION 2572
 #define SCI_ADDSELECTION 2573
diff --git a/include/Scintilla.iface b/include/Scintilla.iface
index 0456615e2..ef35fe6a4 100644
--- a/include/Scintilla.iface
+++ b/include/Scintilla.iface
@@ -2100,6 +2100,9 @@ get bool GetAdditionalCaretsVisible=2609(,)
 # How many selections are there?
 get int GetSelections=2570(,)
 
+# Is every selected range empty?
+get bool GetSelectionEmpty=2650(,)
+
 # Clear selections to a single empty stream selection
 fun void ClearSelections=2571(,)
 
diff --git a/src/Editor.cxx b/src/Editor.cxx
index f3c7709a0..3fabf1ab7 100644
--- a/src/Editor.cxx
+++ b/src/Editor.cxx
@@ -9147,6 +9147,9 @@ sptr_t Editor::WndProc(unsigned int iMessage, uptr_t wParam, sptr_t lParam) {
 	case SCI_GETSELECTIONS:
 		return sel.Count();
 
+	case SCI_GETSELECTIONEMPTY:
+		return sel.Empty();
+
 	case SCI_CLEARSELECTIONS:
 		sel.Clear();
 		Redraw();