MathUtils: Add tangential interpolation

Reuse it in TaskProgress and in ProgressTimer.
Rename MathUtils::interpolate() into interpolateLinear()

Change-Id: Iff4cda1e3b8782cd26277ec75046ca5526be92c0
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/plugins/diffeditor/unifieddiffeditorwidget.cpp b/src/plugins/diffeditor/unifieddiffeditorwidget.cpp
index c082db78ec..6e8abb9c24 100644
--- a/src/plugins/diffeditor/unifieddiffeditorwidget.cpp
+++ b/src/plugins/diffeditor/unifieddiffeditorwidget.cpp
@@ -436,7 +436,7 @@ UnifiedDiffOutput UnifiedDiffData::diffOutput(QFutureInterface<void> &fi, int pr
                     output.diffData.m_chunkInfo.setChunkIndex(oldBlock, blockNumber - oldBlock, j);
             }
         }
-        fi.setProgressValue(MathUtils::interpolate(++i, 0, count, progressMin, progressMax));
+        fi.setProgressValue(MathUtils::interpolateLinear(++i, 0, count, progressMin, progressMax));
         if (fi.isCanceled())
             return {};
     }
@@ -511,7 +511,7 @@ void UnifiedDiffEditorWidget::showDiff()
             const QString package = output.diffText.mid(currentPos, packageSize);
             cursor.insertText(package);
             currentPos += package.size();
-            fi.setProgressValue(MathUtils::interpolate(currentPos, 0, diffSize, firstPartMax, progressMax));
+            fi.setProgressValue(MathUtils::interpolateLinear(currentPos, 0, diffSize, firstPartMax, progressMax));
             if (futureInterface.isCanceled())
                 return;
         }