NOISSUE even more java polishing

* Memory minimums lowered to 128M in all Java settings UIs
* Changing the memory sizes on the wizard page does not automatically trigger checks if the executable doesn't have 'java' in the name
* Java detection on linux now scans some common JRE locations, not just /usr/bin/java

api/logic/java/JavaUtils.cpp

@@ -154,10 +154,12 @@ QList<QString> JavaUtils::FindJavaPaths()
 		KEY_WOW64_32KEY, "SOFTWARE\\JavaSoft\\Java Development Kit");
 
 	java_candidates.append(JRE64s);
+	java_candidates.append(MakeJavaPtr("C:/Program Files/Java/jre8/bin/javaw.exe"));
 	java_candidates.append(MakeJavaPtr("C:/Program Files/Java/jre7/bin/javaw.exe"));
 	java_candidates.append(MakeJavaPtr("C:/Program Files/Java/jre6/bin/javaw.exe"));
 	java_candidates.append(JDK64s);
 	java_candidates.append(JRE32s);
+	java_candidates.append(MakeJavaPtr("C:/Program Files (x86)/Java/jre8/bin/javaw.exe"));
 	java_candidates.append(MakeJavaPtr("C:/Program Files (x86)/Java/jre7/bin/javaw.exe"));
 	java_candidates.append(MakeJavaPtr("C:/Program Files (x86)/Java/jre6/bin/javaw.exe"));
 	java_candidates.append(JDK32s);
@@ -205,9 +207,36 @@ QList<QString> JavaUtils::FindJavaPaths()
 
 	QList<QString> javas;
 	javas.append(this->GetDefaultJava()->path);
-    javas.append("/opt/java/bin/java");
+	auto scanJavaDir = [&](const QString & dirPath)
-    javas.append("/usr/bin/java");
+	{
+		QDir dir(dirPath);
+		if(!dir.exists())
+			return;
+		auto entries = dir.entryInfoList(QDir::Dirs | QDir::NoDotAndDotDot | QDir::NoSymLinks);
+		for(auto & entry: entries)
+		{
 
+			QString prefix;
+			if(entry.isAbsolute())
+			{
+				prefix = entry.absoluteFilePath();
+			}
+			else
+			{
+				prefix = entry.filePath();
+			}
+
+			javas.append(FS::PathCombine(prefix, "jre/bin/java"));
+			javas.append(FS::PathCombine(prefix, "bin/java"));
+		}
+	};
+	// oracle RPMs
+	scanJavaDir("/usr/java");
+	// general locations used by distro packaging
+	scanJavaDir("/usr/lib/jvm");
+	scanJavaDir("/usr/lib32/jvm");
+	// javas stored in MultiMC's folder
+	scanJavaDir("java");
 	return javas;
 }
 #else

application/pages/InstanceSettingsPage.ui

@@ -109,7 +109,7 @@
              <string notr="true"> MB</string>
             </property>
             <property name="minimum">
-             <number>512</number>
+             <number>128</number>
             </property>
             <property name="maximum">
              <number>65536</number>
@@ -131,7 +131,7 @@
              <string notr="true"> MB</string>
             </property>
             <property name="minimum">
-             <number>256</number>
+             <number>128</number>
             </property>
             <property name="maximum">
              <number>65536</number>

application/pages/global/JavaPage.ui

@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>545</width>
-    <height>559</height>
+    <height>760</height>
    </rect>
   </property>
   <property name="sizePolicy">
@@ -54,7 +54,7 @@
              <string notr="true"> MB</string>
             </property>
             <property name="minimum">
-             <number>512</number>
+             <number>128</number>
             </property>
             <property name="maximum">
              <number>65536</number>
@@ -90,7 +90,7 @@
              <string notr="true"> MB</string>
             </property>
             <property name="minimum">
-             <number>256</number>
+             <number>128</number>
             </property>
             <property name="maximum">
              <number>65536</number>

application/setupwizard/JavaWizardPage.cpp

@@ -85,7 +85,7 @@ void JavaWizardPage::setupUi()
 	m_minMemSpinBox = new QSpinBox(m_memoryGroupBox);
 	m_minMemSpinBox->setObjectName(QStringLiteral("minMemSpinBox"));
 	m_minMemSpinBox->setSuffix(QStringLiteral(" MB"));
-	m_minMemSpinBox->setMinimum(256);
+	m_minMemSpinBox->setMinimum(128);
 	m_minMemSpinBox->setMaximum(m_availableMemory);
 	m_minMemSpinBox->setSingleStep(128);
 	m_labelMinMem->setBuddy(m_minMemSpinBox);
@@ -98,7 +98,7 @@ void JavaWizardPage::setupUi()
 	m_maxMemSpinBox = new QSpinBox(m_memoryGroupBox);
 	m_maxMemSpinBox->setObjectName(QStringLiteral("maxMemSpinBox"));
 	m_maxMemSpinBox->setSuffix(QStringLiteral(" MB"));
-	m_maxMemSpinBox->setMinimum(512);
+	m_maxMemSpinBox->setMinimum(128);
 	m_maxMemSpinBox->setMaximum(m_availableMemory);
 	m_maxMemSpinBox->setSingleStep(128);
 	m_labelMaxMem->setBuddy(m_maxMemSpinBox);
@@ -254,7 +254,7 @@ void JavaWizardPage::memoryValueChanged(int)
 	}
 	if(actuallyChanged)
 	{
-		checkJavaPath(m_javaPathTextBox->text());
+		checkJavaPathOnEdit(m_javaPathTextBox->text());
 	}
 }
 
@@ -363,7 +363,11 @@ void JavaWizardPage::setJavaStatus(JavaWizardPage::JavaStatus status)
 
 void JavaWizardPage::javaPathEdited(const QString& path)
 {
-	// only autocheck
+	checkJavaPathOnEdit(path);
+}
+
+void JavaWizardPage::checkJavaPathOnEdit(const QString& path)
+{
 	auto realPath = FS::ResolveExecutable(path);
 	QFileInfo pathInfo(realPath);
 	if (pathInfo.baseName().toLower().contains("java"))

application/setupwizard/JavaWizardPage.h

@@ -52,6 +52,7 @@ protected slots:
 	void checkFinished(JavaCheckResult result);
 
 protected: /* methods */
+	void checkJavaPathOnEdit(const QString &path);
 	void checkJavaPath(const QString &path);
 	void setJavaStatus(JavaStatus status);
 	void setupUi();