commit c8e1c092369a6708499d4503f620d028968d2167
Author: Jean-Marc Lasgouttes <[email protected]>
Date:   Fri Apr 22 12:11:00 2016 +0200

    Fix horizontal scrolling in full-width collapsable insets
    
    While a one paragraph large collapsable inset (containing for example a 
tabular) could be very wide and trigger horizontal scrolling, the code that 
makes collapsable insets wide when they contain several paragraphs would 
actually make them narrower in this case.
    
    Typical example is a wide tabular and a caption in a table float, where 
horizontal scrolling would not trigger.
    
    (cherry picked from commit 8c7ace4b on 2.3.0-staging)

diff --git a/src/TextMetrics.cpp b/src/TextMetrics.cpp
index 810b21a..816f4ba 100644
--- a/src/TextMetrics.cpp
+++ b/src/TextMetrics.cpp
@@ -448,7 +448,7 @@ bool TextMetrics::redoParagraph(pit_type const pit)
                setRowHeight(row, pit);
                row.setChanged(false);
                if (row_index || row.endpos() < par.size()
-                       || (row.right_boundary() && par.inInset().lyxCode() != 
CELL_CODE))
+                   || (row.right_boundary() && par.inInset().lyxCode() != 
CELL_CODE)) {
                        /* If there is more than one row or the row has been
                         * broken by a display inset or a newline, expand the 
text
                         * to the full allowable width. This setting here is
@@ -458,7 +458,9 @@ bool TextMetrics::redoParagraph(pit_type const pit)
                         * that, and it triggers when using a caption in a
                         * longtable (see bugs #9945 and #9757).
                         */
-                       dim_.wid = max_width_;
+                       if (dim_.wid < max_width_)
+                               dim_.wid = max_width_;
+               }
                int const max_row_width = max(dim_.wid, row.width());
                computeRowMetrics(pit, row, max_row_width);
                first = row.endpos();
diff --git a/status.22x b/status.22x
index d05694f..eb6625a 100644
--- a/status.22x
+++ b/status.22x
@@ -54,6 +54,9 @@ What's new
 - Display the correct column alignment and a better column spacing in AMS
   environments (bugs 1861, 9908).
 
+- Fix horizontal scrolling feature when inside a collapsable inset
+  with several paragraphs.
+
 - Fix display of collapsable insets when the same document is shown in
   two views with different width (bug 9756).
 

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