Bug 1626665: part 7) Declare `nsILineIterator::GetLine` `const`. r=hsivonen

Differential Revision: https://phabricator.services.mozilla.com/D70012

--HG--
extra : moz-landing-system : lando

layout/generic/nsILineIterator.h

@@ -56,7 +56,7 @@ class nsILineIterator {
   // the line; if a frame was moved because of relative positioning
   // then its coordinates may be outside the line bounds).
   NS_IMETHOD GetLine(int32_t aLineNumber, nsIFrame** aFirstFrameOnLine,
-                     int32_t* aNumFramesOnLine, nsRect& aLineBounds) = 0;
+                     int32_t* aNumFramesOnLine, nsRect& aLineBounds) const = 0;
 
   /**
    * Given a frame that's a child of the block, find which line its on

layout/generic/nsLineBox.cpp

@@ -609,7 +609,7 @@ bool nsLineIterator::GetDirection() { return mRightToLeft; }
 
 NS_IMETHODIMP
 nsLineIterator::GetLine(int32_t aLineNumber, nsIFrame** aFirstFrameOnLine,
-                        int32_t* aNumFramesOnLine, nsRect& aLineBounds) {
+                        int32_t* aNumFramesOnLine, nsRect& aLineBounds) const {
   NS_ENSURE_ARG_POINTER(aFirstFrameOnLine);
   NS_ENSURE_ARG_POINTER(aNumFramesOnLine);
 

layout/generic/nsLineBox.h

@@ -1646,7 +1646,8 @@ class nsLineIterator final : public nsILineIterator {
   virtual int32_t GetNumLines() override;
   virtual bool GetDirection() override;
   NS_IMETHOD GetLine(int32_t aLineNumber, nsIFrame** aFirstFrameOnLine,
-                     int32_t* aNumFramesOnLine, nsRect& aLineBounds) override;
+                     int32_t* aNumFramesOnLine,
+                     nsRect& aLineBounds) const override;
   virtual int32_t FindLineContaining(nsIFrame* aFrame,
                                      int32_t aStartLine = 0) override;
   NS_IMETHOD FindFrameAt(int32_t aLineNumber, nsPoint aPos,

layout/tables/nsTableRowGroupFrame.cpp

@@ -1702,7 +1702,8 @@ bool nsTableRowGroupFrame::GetDirection() {
 
 NS_IMETHODIMP
 nsTableRowGroupFrame::GetLine(int32_t aLineNumber, nsIFrame** aFirstFrameOnLine,
-                              int32_t* aNumFramesOnLine, nsRect& aLineBounds) {
+                              int32_t* aNumFramesOnLine,
+                              nsRect& aLineBounds) const {
   NS_ENSURE_ARG_POINTER(aFirstFrameOnLine);
   NS_ENSURE_ARG_POINTER(aNumFramesOnLine);
 

layout/tables/nsTableRowGroupFrame.h

@@ -214,7 +214,8 @@ class nsTableRowGroupFrame final : public nsContainerFrame,
    * @param aLineBounds       - rect of the row
    */
   NS_IMETHOD GetLine(int32_t aLineNumber, nsIFrame** aFirstFrameOnLine,
-                     int32_t* aNumFramesOnLine, nsRect& aLineBounds) override;
+                     int32_t* aNumFramesOnLine,
+                     nsRect& aLineBounds) const override;
 
   /** Given a frame that's a child of the rowgroup, find which line its on.
    * @param aFrame       - frame, should be a row