BootManager: improved layouting

Addresses #15418 without completely solving it.
At least for font sizes >= 11 points it works mostly. Buttons are
no longer cut off, though the summary page showing all partitions
is taller than necessary for > 3 partitions, esp. for smaller font
sizes.

Views aren't vertically centered at least.

Change-Id: Id6224b83f27510c9ed45e303f0b5dabf47af0574
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7062
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>

src/apps/bootmanager/BootManagerWindow.cpp

@@ -36,15 +36,14 @@ BootManagerWindow::BootManagerWindow()
 	GetSizeLimits(&minWidth, &maxWidth, &minHeight, &maxHeight);
 
 	minWidth = be_control_look->DefaultLabelSpacing() * 67.0f;
-	minHeight = be_control_look->DefaultLabelSpacing() * 42.0f;
+	minHeight = be_control_look->DefaultLabelSpacing() * 52.0f;
 	SetSizeLimits(minWidth, maxWidth, minHeight, maxHeight);
 
 	fWizardView = new WizardView("wizard");
 	BLayoutBuilder::Group<>(this)
 		.Add(fWizardView);
 
 	fController.Initialize(fWizardView);
-
 	CenterOnScreen();
 
 	// Prevent minimizing this window if the user would have no way to

src/apps/bootmanager/DescriptionPage.cpp

@@ -41,5 +41,6 @@ DescriptionPage::_BuildUI(const char* description, bool hasHeading)
 	SetLayout(new BGroupLayout(B_VERTICAL));
 
 	BLayoutBuilder::Group<>((BGroupLayout*)GetLayout())
-		.Add(fDescription);
+		.Add(fDescription)
+		.AddGlue();
 }

src/apps/bootmanager/DrivesPage.cpp

@@ -277,8 +277,8 @@ DrivesPage::DrivesPage(WizardView* wizardView, const BootMenuList& menus,
 	SetLayout(new BGroupLayout(B_VERTICAL));
 
 	BLayoutBuilder::Group<>((BGroupLayout*)GetLayout())
-		.Add(description, 0.5)
-		.Add(scrollView, 1);
+		.Add(description)
+		.Add(scrollView, 10.0);
 
 	_UpdateWizardButtons(NULL);
 	_FillDrivesView(menus);

src/apps/bootmanager/PartitionsPage.cpp

@@ -110,7 +110,7 @@ PartitionsPage::_BuildUI()
 
 	BLayoutBuilder::Group<>((BGroupLayout*)GetLayout())
 		.Add(fDescription)
-		.Add(scrollView);
+		.Add(scrollView, 10.0);
 }
 
 

src/apps/bootmanager/WizardView.cpp

@@ -55,6 +55,7 @@ WizardView::SetPage(WizardPageView* page)
 		return;
 
 	fPageContainer->AddChild(page);
+	Window()->ResizeToPreferred();
 }